Just like the physical energy required to run a marathon, you need a big ol’ pool of mental energy for the psychological demands of building a business. It’s common sense but often de-prioritized amidst the startup whirlwind. It’s a prerequisite. It’s what makes everything possible.

When your pool is full you can take on the world. When it’s drained maybe you can go through the motions but your company needs way more than that. And if it’s drained too much of the time, there’s the ever-present risk of depression and complete burnout.